c# - Passing DataContext in Telerik RadGridView -

i use c# .net 4.5 , wpf radcontrols telerik.

on mainwindow have radtabcontrol , in code behind bind mainviewmodel this:

 this.datacontext = new mainviewmodel(); 

the itemsource of radtabcontrol bound in xaml:

 <telerik:radtabcontrol ... itemssourc={binding tabs} .. /> 

i use contentselector load different contents tabs. these contents usercontrols. on 1 usercontrol use radgridview it's own itemssource bind in code behind:

testgridview.itemssource = tasks.gettasks(); 

the radgridview columns bound it's own style:

 <telerik:radgridview.columns>    <telerik:gridviewdatacolumn datamemberbinding="{binding id}" width="*" cellstyle="{staticresource cellstyle}" />  </telerik:radgridview.columns>    <style x:key="cellstyle" targettype="{x:type telerik:gridviewcell}">         <setter property="borderthickness" value="0" />         <setter property="borderbrush" value="{x:null}" />         <setter property="template">             <setter.value>                 <controltemplate>                     <border borderbrush="#f2f2f2" borderthickness="0,0,0,2" padding="0,5,0,5">                         <stackpanel orientation="horizontal">                             <stackpanel orientation="vertical" margin="10,0,0,0" verticalalignment="top">                                 <textblock text="{binding titel}" />                                 <stackpanel orientation="horizontal">                                     <textblock text="{binding start}" foreground="#9fa2ae"/>                                     <textblock text=" xxx - xxx " />                                     <textblock text="{binding startzeit}" foreground="#9fa2ae" />                                     <telerik:radbutton height="30" content="right button" command="{binding addtabcommand}" commandparameter="tab9999"/>                                 </stackpanel>                             </stackpanel>                         </stackpanel>                     </border>                 </controltemplate>             </setter.value>         </setter>     </style> 

the problem radbutton not fire delegatecommand of mainviewmodel. have same button in usercontrol out of radgridview, works fine.

please can tell me how can fix problem of radbutton in radgridview?

thanks lot best regards rr

ps: have simple project, can't attach it

the reason why happening binding on radbutton trying find addtabcommand on datacontext of button, not parent window.

to fix this, advise setting style inside window's resources, , instead of using this:

command="{binding addtabcommand}" 

give window name, , use this:

command="{binding elementname=windowname, path=datacontext.addtabcommand}"